乐团学员列表，报名缴费状态变更为未开启，已缴费，未缴费，涉及到导出

mec-biz/src/main/java/com/ym/mec/biz/dal/dto/MusicGroupStudentsDto.java

@@ -74,7 +74,7 @@ public class MusicGroupStudentsDto{
     private BigDecimal subTotalCourseTime;
 
     @ApiModelProperty(value = "欠费金额",required = false)
-    private BigDecimal noPaymentAmount;
+    private BigDecimal noPaymentAmount = BigDecimal.ZERO;
 
     @ApiModelProperty(value = "关心包：0：默认不可用；1：可用；2：已使用;")
     private Integer carePackage;